//----------------------------------------------------------------------------------------
// @Project Includes
#include "includes.h"

//----------------------------------------------------------------------------------------
// @Local Macro Define in the module

//----------------------------------------------------------------------------------------
// @Local Type defines in the module

//----------------------------------------------------------------------------------------
// @Global Variables define in the module
//crc的查询表
#if 0
const uint8_t CRC8Table[]=
{   //120424-1            CRC Table
    0x00,0x07,0x0E,0x09,0x1C,0x1B,0x12,0x15,0x38,0x3F,0x36,0x31,0x24,0x23,0x2A,0x2D,
    0x70,0x77,0x7E,0x79,0x6C,0x6B,0x62,0x65,0x48,0x4F,0x46,0x41,0x54,0x53,0x5A,0x5D,
    0xE0,0xE7,0xEE,0xE9,0xFC,0xFB,0xF2,0xF5,0xD8,0xDF,0xD6,0xD1,0xC4,0xC3,0xCA,0xCD,
    0x90,0x97,0x9E,0x99,0x8C,0x8B,0x82,0x85,0xA8,0xAF,0xA6,0xA1,0xB4,0xB3,0xBA,0xBD,
    0xC7,0xC0,0xC9,0xCE,0xDB,0xDC,0xD5,0xD2,0xFF,0xF8,0xF1,0xF6,0xE3,0xE4,0xED,0xEA,
    0xB7,0xB0,0xB9,0xBE,0xAB,0xAC,0xA5,0xA2,0x8F,0x88,0x81,0x86,0x93,0x94,0x9D,0x9A,
    0x27,0x20,0x29,0x2E,0x3B,0x3C,0x35,0x32,0x1F,0x18,0x11,0x16,0x03,0x04,0x0D,0x0A,
    0x57,0x50,0x59,0x5E,0x4B,0x4C,0x45,0x42,0x6F,0x68,0x61,0x66,0x73,0x74,0x7D,0x7A,
    0x89,0x8E,0x87,0x80,0x95,0x92,0x9B,0x9C,0xB1,0xB6,0xBF,0xB8,0xAD,0xAA,0xA3,0xA4,
    0xF9,0xFE,0xF7,0xF0,0xE5,0xE2,0xEB,0xEC,0xC1,0xC6,0xCF,0xC8,0xDD,0xDA,0xD3,0xD4,
    0x69,0x6E,0x67,0x60,0x75,0x72,0x7B,0x7C,0x51,0x56,0x5F,0x58,0x4D,0x4A,0x43,0x44,
    0x19,0x1E,0x17,0x10,0x05,0x02,0x0B,0x0C,0x21,0x26,0x2F,0x28,0x3D,0x3A,0x33,0x34,
    0x4E,0x49,0x40,0x47,0x52,0x55,0x5C,0x5B,0x76,0x71,0x78,0x7F,0x6A,0x6D,0x64,0x63,
    0x3E,0x39,0x30,0x37,0x22,0x25,0x2C,0x2B,0x06,0x01,0x08,0x0F,0x1A,0x1D,0x14,0x13,
    0xAE,0xA9,0xA0,0xA7,0xB2,0xB5,0xBC,0xBB,0x96,0x91,0x98,0x9F,0x8A,0x8D,0x84,0x83,
    0xDE,0xD9,0xD0,0xD7,0xC2,0xC5,0xCC,0xCB,0xE6,0xE1,0xE8,0xEF,0xFA,0xFD,0xF4,0xF3
};
#endif

//----------------------------------------------------------------------------------------
// @Prototypes of functions in the module

//========================================================================================
/**
 * @brief  modbus crc calcu
 * @param  pBuf : 参与校验的数据
 *			   _usLen : 数据长度
 * @return crc  vaule
 * @note   none
 */
uint16_t srv_crc16_pc(uint8_t *_pBuf, uint16_t _usLen)
{
		uint16_t u16crc16 = 0;
	  uint16_t u16i;
	  for (u16i = 0; u16i < _usLen; u16i++)
		{
			  u16crc16 += _pBuf[u16i];
		}
		
		u16crc16 = ~u16crc16 + 1;
		
		return u16crc16;
		
}

/**
 * @brief  sys crc calcu
 * @param  addr：待校验数据基地址
 *         num：待校验数据长度
 *         crc：crc初值
 * @return crc  vaule
 * @note   none
 */
uint16_t srv_crc16_system(uint8_t *addr, uint32_t num, uint16_t crc)
{
    uint8_t i;
    for (; num > 0; num--)/* Step through bytes in memory */
    {
        crc = crc ^ (*addr++ << 8);/* Fetch byte from memory, XOR into CRC top byte*/
        for (i = 0; i < 8; i++)/* Prepare to rotate 8 bits */
        {
            if (crc & 0x8000)/* b15 is set... */
            {
                crc = (crc << 1) ^ 0x1021;/* rotate and XOR with polynomic */
            }
            else/* b15 is clear... */
            {
                crc <<= 1;/* just rotate */
            }
        }/* Loop for 8 bits */
        crc &= 0xFFFF;/* Ensure CRC remains 16-bit value */
    }/* Loop until num=0 */
    return(crc);/* Return updated CRC */
}

/**
 * @brief  afe crc calcu
 * @param  pBuf : 参与校验的数据
 *			   _usLen : 数据长度
 * @return crc  vaule
 * @note   none
 */
uint8_t srv_crc8_afe(uint8_t *_pBuf, uint16_t _usLen)
{
#if 0
    uint8_t crc8 = 0;    
    
    for(; _usLen > 0; _usLen--)
    {    
        crc8 = CRC8Table[crc8^*_pBuf];    
        _pBuf++;    
    } 
       
    return(crc8); 
#else
		uint8_t crc = 0;
		uint8_t i = 0;
		while(_usLen--)
		{
			 crc ^= *_pBuf++;
			 for(i = 0;i < 8;i++)
			 {
					 if(crc & 0x80)
					 {
							 crc = (crc << 1) ^ 0x07;
					 }
					 else crc <<= 1;
			 }
		}
		return crc;	
#endif	
}

/**
 * @brief  cosm crc calcu
 * @param  pBuf : 参与校验的数据
 *			   _usLen : 数据长度
 * @return crc  vaule
 * @note   none
 */
uint8_t srv_crc8_cosm(uint8_t *_pBuf, uint16_t _usLen)
{
		uint8_t crc = 0;
		uint16_t i = 0;
	
	  for (i = 0; i < _usLen; i++)
		{
				crc += *_pBuf++;;
		}
		//crc &= 0x00FF;
		
		return crc;	
}

#if 0
void srv_crc_test(void)
{
    uint8_t temp[10]= {0x40, 0x1D, 0x41,0x82,0xcd,0x30, 0x5D, 0x71,0x82,0x9d};
		uint16_t crc = 0;
		
		crc = srv_crc16_system(temp, 10, crc);
		crc = crc;

}
#endif


// =======================================================================================
// End of file.
// =======================================================================================
